There was a hiccup in uploading a new slimapp version to our cloud infrastructure, but everything should be up and running now. Just build a new PhoneGap app and you should be good to go.
I have issues with the new functionality as well.
I implemented it in the same way as Pim did.
When I test the app my results differ slightly. When I kill the app and open the app again I do not have to login.
However the next day I do need to login to the app again. (this is on an Android Phone and an Android tablet, both give the same issue)